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Faculty of Mathematics and Natural Sciences - Biogeography

Faculty of Mathematics and Natural Sciences | Geography Department | Biogeography | News | Conservation strategies must adapt when landscapes change

Conservation strategies must adapt when landscapes change

 

Macchi, L., Decarre, J., Goijman, A.P., Mastrangelo, M., Blendinger, P.G., Gavier-Pizarro, G.I., Murray, F., Piquer-Rodriguez, M., Semper-Pascual, A., Kummerle, T.

 

Summary:

- Agriculture provides societies with food and biomass, but where agriculture expands into tropical and subtropical forests, biodiversity losses can be large.

- Understanding how exactly agriculture impacts biodiversity is therefore critically important for helping farmers and planners to find ways to avoid biodiversity losses.

- Our study shows that this can be much trickier than thought: how biodiversity responds to intensifying agriculture very much depends on the type of landscape – and landscapes can change drastically as deforestation progresses.

- This means that conservation strategies must be flexible as well to avoid failing.

 

Abstract:

- Understanding how biodiversity responds to intensifying agriculture is critical to mitigating the trade‐offs between them. These trade‐offs are particularly strong in tropical and subtropical deforestation frontiers, yet it remains unclear how changing landscape context in such frontiers alters agriculture–biodiversity trade–offs.

- We focus on the Argentinean Chaco, a global deforestation hotspot, to explore how landscape context shapes trade‐off curves between agricultural intensity and avian biodiversity. We use a space‐for‐time approach and integrate a large field dataset of bird communities (197 species, 234 survey plots), three agricultural intensity metrics (meat yield, energy yield and profit) and a range of environmental covariates in a hierarchical Bayesian occupancy framework.

- Woodland extent in the landscape consistently determines how individual bird species, and the bird community as a whole, respond to agricultural intensity. Many species switch in their fundamental response, from decreasing occupancy with increased agricultural intensity when woodland extent in the landscape is low (loser species), to increasing occupancy with increased agricultural intensity when woodland extent is high (winner species).

- This suggests that landscape context strongly mediates who wins and loses along agricultural intensity gradients. Likewise, where landscapes change, such as in deforestation frontiers, the very nature of the agriculture–biodiversity trade–offs can change as landscapes transformation progresses.

Synthesis and applications. Schemes to mitigate agriculture–biodiversity trade–offs, such as land sparing or sharing, must consider landscape context. Strategies that are identified based on a snapshot of data risk failure in dynamic landscapes, particularly where agricultural expansion continues to reduce natural habitats. Rather than a single, fixed strategy, adaptive management of agriculture–biodiversity trade–offs is needed in such situations. Here we provide a toolset for considering changing landscape contexts when exploring such trade‐offs. This can help to better align agriculture and biodiversity in tropical and subtropical deforestation frontiers.

 

Link to the manuscript: https://doi.org/10.1111/1365-2664.13699

 

Citation: Macchi et al. 2020. Trade‐offs between biodiversity and agriculture are moving targets in dynamic landscapes. Journal Applied Ecology. Early View.

 

 

Fig.: Julieta Decarre